Audiobooks discussion

I listen to a lolt of Audible on my 5g video IPod. I'm on my 63rd book for this year. Sometimes I have problem at playing an Audible title. At some point in the audiobook, my IPod crashes. It does not happen too often, but it does happen with different titles, such as "Stiff: The Curious Lives of Human Cadavers." Has anyone had this problem before?